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5.2. Replacing a Controller Module
5.2.1 Overview
Two replaceable components are contained in a controller module:
DIMM Module: The DIMM module can be replaced when a DIMM
CBM (optional): As part of the CBM module, a BBU within is usually
WARNING!
1. The BBU within the chassis is not hot-swappable. BBU is contained in a
RAID controller canister. To replace a BBU, you must remove a RAID
controller. It is recommended to remove the BBU before replacing a DIMM
module because once a controller is removed from the chassis, BBU will
discharge to support the cache memory. If you replace a DIMM module
with supplied voltage, damage may occur.
2. Replace a DIMM one (1) minute after the BBU is removed.
5.2.2 Notes on Controller Maintenance
Re-using the DIMM module removed from a failed controller is not
recommended unless you have a similar RAID system to test its integrity.
When replacing the controller module, you must remember that the
controller board is one of the most sensitive components in the system. All
previously stipulated safety precautions (see Chapter 2) must be strictly
adhered to. Failure to adhere to these precautions can result in permanent
damage and timely delays.
5.2.3 Removing a Controller Module
To remove a controller module:
Step 1.
Prepare a clean, static-free work pad or container to place the
controller that will be removed from the chassis.
Step 2.
Make sure there is no access from host computers to the
system to avoid losing data. Stop all I/O access to the
system and make sure all cached writes have been distributed
to disk drives using firmware's "Shutdown Controller" function
(if access to controller firmware is still possible).
module fails or if a larger capacity DIMM is required.
replaced every three (3) years. If a BBU has lost its
ability to hold electric charge, replace it with a certified
module.
Chapter 5: System Maintenance
5-3
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